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I (No Model.) 2 Sheets-Sheet 1. G. DINPREVILLE.

TELEGRAPH APPARATUS.

No. 274,112. Patented Mar. 20,1883.

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G. DINPREVILLE.

TELEGRAPH APPARATUS. No. 274,112. Patented Mar. 20,1883.

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.UNITED STATES PATENT OFFICE.

GEORGES DINFREVILLE, OF NEW YORK, N. Y.

TELEGRAPH APPARATUS.

SPECIFICATION forming part of Letters Patent No. 274,112,-dated March 20, 1883.

7 Application filed February 520, 1382. (No model.)

T 0 all whom ti may concern:

Be it known that I, Gnonens DINF-nn- VILLE, of the city, county, and State of New York,haveinventedanew and usefulltnprovement in Telegraphic Apparatus, of which the following is a full, true, and exact description, reference being bad to the accompanying dra wings.

It is well known that in the present system of telegraphy much difliculty arises from the interrupted or false signals, due to currents affecting the main line from neighboring wires, or in some cases from disturbing current-s arising from various causes on the wire itself, and it is well known, also, that these difficulties are sometimes aggravated in duplex telegraphy by static induction-currents ;.and thereis still another difiiculty in quadruplex telegrapby d cc to the reversal of polarity in the neutral relay and the consequent shattering or interruption of signal which may be at thatmoment in process of reception on said neutral relay. These (lifticulties have been attempted to be avoided in quadruplex telegraphy by what are known as bug-traps, which are,in general apparatuses, so arranged in connection with the receivingrelay that the receiving sounder will not instantly respond to every slight movement of the tongue of the relay.

My present apparatus is an improvement upon the bug-traps heretofore in use, and its object is to protect with greater etliciency and certainty the receiving apparatus, which may be a sounder, recorder, or register placed in a local or repeating circuit controlled by a relay.

My apparatus is especially applicable when the receiving-relay is included in the main circuit of a duplex, diplex, triplex, quadrupleX, harmonic, or multiplex telegraph.

By means of this apparatus the reception of false, wavy, shattering, or uncertain signals may be prevented upon the sounder or recorder.

My invention consists, generally, in the combination of a polarized sounder whose art-nature is vibrated in both directions by changes in polarity in the sounder with a relay which is so connected as to reverse the direction or flow of current through the sounder, or to reverse the eifect of the current in its eii'ect upon the armature of the polarized sounder.

In my drawings I have shown three combinations of my improved sounder with receiving-relays.

Figure 1 shows it in connection with an ordinary singletransmission Morse line, Fig. 2 in connection with duplex transmission, and Fig. 3 in connection with quadruplex transmission. Fig. 4 shows a modification of my invention.

Similar letters of reference refer generally to similar parts in all the figures.

In Fig. 1, L represents the main line, connecting with the ground at G. The main battery (shown by B) is connected with the key K, provided with the ordinary closing-switch, O. it represents the ordinary receiving-relay, provided with two contact-points, P and Q, instead of one only, as is usually the case. The tongue of the relay is represented by I). (t is the local battery.

S represents a difi'eren tiall y-wou n d polarized sounder. It will be readily seen that the sounder S will vibrate responsively to the movements of the tongue B, the battery a, beingcaused to tlow in opposite directions through its coils, depending upon the position of the tongue I); but this sounder has this peculiarity, whereby it may be distinguished from an ordinary sounder: In an ordinary sounder the instant the tongue Z) of the relay it leaves its front stop the armature of the sounder will also begin to retire. Inthe arrangement shown the sotmder-armature will remain against the stop with which it may bein contact until the tongue I) has reached the opposite contactpoint, when the reversal of polarity in the sounder S will cause its armature to be thrown over to the opposite side. Of course the same result could be readily accomplished in singly-wound polarized sounder by the use of two batteries, which system is shown in Fig. 2 in connection with duplex transmission. in this system the relay It is placed in a bridge-wire, according to the method patented to Stearns. A full description will not be given. as the method of its action will be readily-understood by any electrician. in this tigure the sounder S has but one coil. Two local batteries, a and b, are shown having their opposite poles in con nection with the coils oi the sounder S, their IOO other poles being connected with the contactpoints P and Q, as is clearly shown. Vhen the tongue of the relay R has been brought in contact with the front stop,p, the battery a will be caused to flow through the sounder S, thereby advancing its armature against the front stop.

In Fi 3 I have shown my improved apparatus in connection with a system of quadruplex transmission. It represents the neutral relay, and P the polarized relay well known in the Edison quadrnplex system. The relay R is connected with the repeating-sounder M in the same manner as the sounder S is connected in Fig. 1, and the receiving-sounder S is connected with the repeating-sounder M in the same manner as the sounder S is connected with the relay R in Fig. 2; but it is obvious that either two batteries and a singly-wound sounde: or a single battery with a doublywound sounder might be used in either case. The sounder S is connected with the polarized relay P in the same manner as the sounder S is connected with the relay St in Fig. 1. At the moment of reversal of the current in the neutral relay R its armature may leave its front contact-stop, and consequently I have shown two polarized sounders in connection with it for greater security in some cases.

it will be obvious that by this invention any variation in the pressure of contact between the tongue of the polarized relay and either of its contact-screws will not be perceptible upon the reccivingsounderafter the armature of the latter has accomplished its motion, for until the tongue of the relay reaches the opposite contact the armature of the sounder will remain firmly in contact with the stop against which it happens to he pressin I do not limit myself, however, to the exclusive use of the particular forms of polarized sounders and relays shown, and to the manners of connecting them which are represented and described; butl intend to inclndc in my invention the use of any other form of instruments and manners of connecting the same, so long as there is no departure from the spirit of my invention.

Care must be taken to regulate the play of the relay-armature and its retraotile spring in each case, so that the trouble due to its false trembling movements may be reduced to a minimum, without, however, altering the duration of the signals more than necessary for receiving them with su'l'licient accuracy. Such a form of apparatiis is shown in Fig. at, in which R represents a receiving-relay; M, the first repeatingsounder, and S the final receiving-sounder. In this apparatus but one battery and a single coil are used foreach sounder; but a reversing apparatus is employedin connection with the relay and with the repeatingsounder, whereby the same eft'ectis produced as that previously described in this specification. Attached to the armature of the relay t is a well-known form of circuit-rcverser, of which the connections will be readily understood by any electrician. The four contactpoints are marked 6 eff e 0, being preferably spring-contacts, to insure certainty of action.

9 is the battery intended to operate the repeating-sounder M.

it will be obvious that as the armature ot' the relay R is caused to vibrate currents alternate in direction will be caused to flow through the repeating-sounder M. To this repeating-sounder is attached some circuit-reversing device, which is caused to reverse the circuit of the battery h, connected to the armature of the repeatingsounder M. The four contact-points in this apparatus are marked 0 ef'f, and the operation is the same as that previously described. I regard, however, the three methods which I have described-- namely, by two batteries and one coil, by two coils and one battery, or by a single coil and a single battery, and a circuit-reversing apparatus-to be mere electrical equivalents for each other, and intend my claims to apply alike to these three forms.

hat I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, in a duplex or quadruplex telegraph, of a receiving-relay provided with front and back contacts and a receiving sounder operated by said receiving-relay, and a battery and the connections shown, whereby reversals of current are caused to tlow through said receiving-sounder only at each complete movement of the armature of the relay from one contact to the other, thereby avoiding the shattering of the signals on the receivingsounders consequent upon incomplete or no cidental motions of the relay-armature, substantially as described.

2. The combination, substantially as described, of two separate electromagnetic coils or heliccsin a local or relayed circuit, an ar mature-lever,constructed and adjusted in the manner described, to retain the position into which it'is drawn by the action ot' either coil until attracted in the opposite direction by the other, a relay clectro-magnet having front and back contact-stops to which the terminals of the two coils are directly and separately connected, and a local battery, one pole of which is connected directly to the relay armatare-lover, while its other pole is connected to said coils or helices.

3. The combination, substantially as described, of a. doubly-wound electro-magnet in one circuit, an armature-lever adapted to retain the position in which it is placed by the action of one of the coils of said clectro-magnot until it is attracted by the action of the other, a main-circuit electro-niagnet, armaturelever therefor, back and front contact-stops for said lever, to which the terminals of the local coils are separately connected, and a local battery one pole of which is connected directly to the armature-lever and the other to both coils of the doubly-wound electromagnet,

4. The combination, substantially as de 5. The combination, with a receiving-relay, of two polarized sounders, the first of which is operated by the relay and the second of 15 which is operated by the first polarized sounder, substantially as shown and described.

GEORGES DINFREVILLE.

Witnesses:

ANTHONY GREF, J12, WM. A. PoLLocK. 

